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41.
利用EAR5再分析气象数据,分析了两次昆明准静止锋天气过程的高低空环流形势、锋面结构、锋面位置、以及相关要素场等基本特征及其异同。结果表明:中高纬度地区阻塞形势的存在是昆明准静止锋形成的背景环流。当冷暖气团均强且势均力敌时,更有利于锋面的维持;冷空气较强时,锋面会向西移动,越过云贵高原地形的阻挡;反之,锋面则会向东移动。当锋面维持在高原地形东侧时,冷空气被地形阻挡时,锋面的移动缓慢,此时锋区最为明显。当锋面维持在地形东侧时,风场的最大水平切变、温度的最大水平梯度和相当位温的密集区,描述的锋面位置几乎相同。两次过程寒潮爆发时冷空气均只能维持到700hPa附近,且水平风场也均为600hPa以下的低空切变,说明昆明准静止锋为浅薄系统。昆明准静止锋与一般冷锋锋后不同,两次个例昆明准静止锋锋后低空为湿区,而锋前水汽是否充足则要看南支槽所处的位置。 相似文献
42.
高温高压下岩石弹性波速特征及其在深部地质研究中的意义 总被引:6,自引:2,他引:6
本文收集、整理、研究了70年代以来的高温高压下岩石的Vp,Vs,Vp/Vs,Vp各向异性等实验资料后得出:(1)低压下岩石Vp的急剧变化是由岩石中裂纹与孔隙等引起的;(2)温度升高可增大由岩石组构引起的Vp各向异性的变化率;(3)同种岩石在不同的大地构造环境中具有不同的波速值与变化规律;(4)Vp在高地温区随温度先降低而后升高,其原因是由矿物相变造成的,与地壳中低速带的性质相当。文章最后讨论了实测波速转换为岩石类型时实验研究岩石波速的意义。 相似文献
43.
文克尔地基模型的最大缺陷是没有考虑地基土的非线性和连续性。利夫金模型虽然对其连续性进行了改进,但过分考虑了基础形状对基床系数的影响,还导致了在矩形基础长短边方向上基床系数的极不对称。为此提出非线性广义文克尔模型,对文克尔模型特征函数重新进行了定义,修正了利夫金模型的缺点,在合理考虑基础形状和尺寸对地基刚度影响的同时,还能分别模拟几种典型情况的反力分布形式。非线性广义文克尔模型还通过分段线性逼近实际p-s曲线的方法,考虑了地基土的非线性。算例分析表明,非线性广义文克尔模型具有一定的合理性和实用性。 相似文献
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桩与地基土之间的相互作用是横向承载桩研究的重要组成部分,相互作用的土反力是挠度和深度的非线性函数,即桩的变形和受力之间呈非线性变化,这种非线性导致了横向承载桩的分析计算十分繁杂。针对问题研究的复杂性,从考虑位移的朗肯土压力理论入手,根据桩出现挠度后引起周边土体的位移量,推导出桩周土反力表达式,在不引入任何地基模型的条件下计算桩身任意深度处基于桩体位移的土反力,简化了问题的分析过程。通过设定算例进行分析,所得出的结果与p-y曲线结果以及实际情况一致,证明了该计算方法的合理性。 相似文献
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This paper presents magnetic susceptibility results of 578 samples from three Devono-Carboniferous carbonate successions in
the Yangtze Block. They indicate that the magnetic susceptibility variations in carbonates are controlled by ancient sea-level
changes. It is particularly so if the supply of detrital materials was low, when the magnetic susceptibility was mainly controlled
by the content of authigenic minerals. If the supply of detrital materials was high, the average susceptibility value would
be higher, but there is still a correlation between susceptibility and sea-level curves. A sea level rise would lead to a
decrease in the content of the detrital materials, and therefore to a decrease in the susceptibility values. On the top of
HST, the uplift and exposure events may lead to elevated magnetic susceptibility values. Carbonate susceptibilities can therefore
be considered as one of the environmental proxy data for the research of sequence stratigraphy. 相似文献
49.
This paper presents magnetic susceptibility results of 578 samples from three Devono-Carboniferous carbonate successions in the Yangtze Block. They indicate that the magnetic susceptibility variations in carbonates are controlled by ancient sea-level changes. It is particularly so if the supply of detrital materials was low, when the magnetic susceptibility was mainly controlled by the content of authigenic minerals. If the supply of detrital materials was high, the average susceptibility value would be higher, but there is still a correlation between susceptibility and sea-level curves. A sea level rise would lead to a decrease in the content of the detrital materials, and therefore to a decrease in the susceptibility values. On the top of HST, the uplift and exposure events may lead to elevated magnetic susceptibility values. Carbonate susceptibilities can therefore be considered as one of the environmental proxy data for the research of sequence stratigraphy. 相似文献
50.
Discovery of Pyrrhotite-Chalcopyrite-Bearing Amphibole Megacrysts in Tongling Area, Anhui Province 总被引:1,自引:0,他引:1
Some pyrrhotite-chalcopyrite-bearing amphibole megacrysts (including pyroxene megacrysts) were discovered in Mesozoic augite diorite-porphyrite at Caoshan in Tongling area, Anhui Province. The amphibole megacrysts, belonging mainly to pargasite and magnesiohastingsite, are characteristic of the amphibole composition derived from mantle and crystallized in lower crust. In general, the aggregates of pyrrhotite-chalcopyrite take the shapes of cylinder and sphere. Three occurrences have been recognized in the amphibole megacrysts: parallel linear, bunchy and scattered. The unique cylinder-like shape of the aggregates and remarkable Ni-poor sulfides in Caoshan are distinctively different from the spherical Ni-rich sulfides in pyroxene megacrysts and any other kinds of megacrysts. In terms of composition, the amphibole megacrysts and their sulfides in Caoshan are similar to those in the pyroxenite xenoliths in Qilin, Guangdong Province. In terms of origin, the pyrrhotite-chalcopyrites as exsolution products resulted from the subsolidus re-equilibration of sulfide solid solution within amphibole megacrysts.amphibole megacrysts were first discovered inside and outside China. This discovery is important for the study of regional magma evolution and its associated mineralizations and ore sources as well. 相似文献